How to grow Rock cress 'Blue Whale'
Keep in mind when planting that Blue Whale is thought of as hardy, so this plant will survive close to or on freezing temperatures.
Growing Blue Whale from seed
Soil temperature should be kept higher than 10°C / 50°F to ensure good germination.
Transplanting Blue Whale
Ensure that temperatures are mild and all chance of frost has passed before planting out, as Blue Whale is a hardy plant.
Harvesting Blue Whale